Plain Jane OEM nothing to see here rebuild

[JustJeff]

Originally Posted by RETed

Is this something that just started to happen?
Was the system working fine prior to this?
Any changes to the cooling system?



Just to eliminate the obvious...
Is the fan pulling air in the correct direction?



Just a side note...
Any type of boost control is going to end up as a bleed-off system
This means that it's next to impossible to get the boost to "zero".
You can only adjust boost down to the base spring pressure - which is most cases is going to be about 7psi - 10psi on an FC turbo with an open exhaust.




Check to see if the radiator is OK:
Get engine warmed up and then check the entire area of the radiator core to see if heat is even; if there are localized spots that are cooler, you have a bad radiator (core).
Stock rated radiator cap is for about 0.9 bar or about 13psi.
I doubt the problem is with the oil system or the oil cooler - do you have an oil temp or oil pressure gauge?

Any reason you're not running double belts?
You really should be running two.
At low RPM's (under 3kRPM), the belt should not be slipping.
If the belt is slipping, it'll be obvious - you can see the pulley slip, and / or hear it slip.
You might also see a lot of excess black dust around the area of the pulleys where the belt is disintegrating.


-Ted

The heating issue has been going on since rebuild was completed. I've noticed it more because I have been driving it further distances...before the car would drive to get errands. Maybe 10 min drive tops with intervals as long as half hour between the next destination. I was having issues with the efan blowing fuses so I thought temps were related to the fan going out on me. Efan wiring has been corrected, it is working as it should..and pulling air through the radiator.

I've had it parked for about a month now. Not related to heat issues, but I sent my injectors off to be cleaned and have in general been tired of working on it....so it sat.

I'm going to try a yoohoo belt and see what that does for temps. I'm not sure if I have slipping or not. The engine does make a noise it did not previously...but doesn't really sound like belt slipping. I previously had an FD alt and dual pulley. I could never get a matched pair that actually matched...I know slipping sound and this isn't quite it. It's almost like a chirping noise...which could be mild slipping and might only effect things once it's NOT idling.

I do not see it slipping, or have any dust, etc.

Reason I don't have dual belts is because I just got the 140 amp S5 alt and have not sourced one yet. I know the obvious places to get them, BUT I'm wanting to get an overdrive pulley. Yes, overdrive. The modded alt only sees 14v when rpms are above 1k or so. I'd like to find a dual pulley a little bit smaller than stock. Just haven't had time to research and find one.

One factor I had not considered before my post. I had the pulleys powder coated. I would not be at all surprised if that is a factor in slipping. I have a yoohoo belt ordered from Napa. I have read the arguments for and against. My plan is to see if single belt is a factor with my problem. If I have to I'll get an OEM sized dual pulley, but like I said I'd prefer overdrive so charging at idle. I'll report back findings.

I'll also be buying a temp gun to test my radiator...see if I have even temps.

For the oil cooler and such. I do have both aftermarket temp and pressure gauges. The pressure gauge I bought used and I think they gave me the wrong sender. According to tech support the gauge is registering that it is not plugged into the sender...but it is. The craptastic OEM pressure gauge reads about normal and the same as pre-rebuild. Oil temps seem normal. They rise slower than water. I'm not sure numbers off the top of my head, but it never struck me as out of line. Next time I'm driving it I'll get some numbers for both.